Cast-iron vise



UNITED STATES PATENT OFFICE.

CHARLES PARKER, OF MERIDEN, CONNECTICUT.

CAST-IRON VISE.

Specification of Letters Patent No. 11,137, dated June 20, 1854.

To all 'wiz-0m t may concern Be it known that I, CHARLES PARKER, of Meriden, county of New I-Iaven, and State of Connecticut, have invented certain new and useful` Improvements in Cast-Iron Vises; and I do hereby declare that the following is a full, clear and eXact description of the same, reference `being made to the annexed drawing, making a part of this specification, in .which- Figure I is an elevation, Fig. II is a top view, Fig. III is a section of a part in detail, and similar letters refer to similar parts throughout. y

My invention consists in so strengthening a cast iron vise as commonly madethat in the pointshitherto found to be the weakest it may be made to sustain t-he maximum of strain due to the ability of the thread on the screw which closes the jaws upon the mass to be held-and this without increasing the weight, or making but a trifling addition to the cost.

In the vise of usual construction the part which invariably breaks first is the sliding` bar to which the front jaw is attachedshown in the drawings at A. If to strengthen this `it were made simply larger, that would involve also a necessity of larger parts in which it is to play. In the vise as shown the action of strain upon the bar A is that of a lever of the second class, the

power being applied at the jaws, the resistance being the upper part of the bar A and the fulcrum being the lower part there-` of. Inasmuchthen as a fracture wouldcommence at the upper edge and extend downward I attain the requisite strength by imbedding in the casting, along the upper side of that bar and near the surface, a chord of wrought iron. The position of this is shown at (Z9) in the sectional Fig. III and in dotted lines in Figs. I and II. The ends of this chord are turned so as to come out through the casting as seen at (c) Figs. I and II for the purpose of securing the chord in place during the process of castingl as well as to increase the hold of the chord.

I have found in practice that the cast iron part of the bar may be fractured atthe upper edge by a strain, and the wrought iron chord will prevent the fracture from extending further, thus enabling the instrument to be kept in use, while but for my improvement it would have been destroyed.

Casting the movable jaw or chapof a vice so as to inclose and secure by the operation one or more wrought iron bars within the tail or guide rod at or near the point of greatest strain Said bars being enlarged or bent at t-he ends the better to secure the same to the casting in order` to act as a chord or chords to resist tensile strain and thereby secure the maximum of strength withthe minimum of metal as described.

CHAS. PARKER.

Witnesses:

S. H. MAYNARD, O. T. SIMMONS. 

